Bharat corrub industries [bci] an iso 9001:2000 company produces cork expansion joint filler. It is preformed from clean, granulated cork particles, bonded together with an insoluble phenolic resin and molded under heat and pressure. The resultant material is strong, light in weight, flexible, acid-resistant and waterproof. Cork will not extrude when compressed up to 50 percent of its original thickness, and regains up to 95 percent as joint expansion takes place. Salient features of expansion joints filler are as follows: